Martins Fernanda O, Rosa Alaina C, Langeani Francisco
UNESP-Universidade Estadual Paulista , Departamento de Zoologia e Botânica, Laboratório de Ictiologia, Instituto de Biociências, Letras e Ciências Exatas, Rua Cristóvão Colombo, 2265, 15054-000, São José do Rio Preto, SP, Brazil.; Email:
Zootaxa. 2014 Oct 20;3873(5):560-70. doi: 10.11646/zootaxa.3873.5.6.
A new Hypoptopomatinae is described from the upper rio Jequitinhonha basin. The new species is distinguished from all congeners by having the ventral laminar expansions of cleithrum and coracoid bearing only 1-30 odontodes, restricted to the area near the pectoral-fin insertion; the anterior plates of mid-ventral lateral series reduced, not ventrally elongated, the first or the second markedly round; pectoral-fin unbranched ray distinctly divided distally, with 7-15 ossified segments, reaching almost half of its length; and accessory process on first epibranchial present. Microlepidogaster discus is further distinguished from its congeners by several other osteological features. The problems concerning the taxonomy of Microlepidogaster, as well as the pattern of distribution of the genus, are discussed.
一种新的下口鲶亚科鱼类在热基蒂尼奥尼亚河上游流域被描述。该新物种与所有同属物种的区别在于，匙骨和乌喙骨的腹侧片状扩展仅带有1至30个齿突，局限于胸鳍插入处附近区域；腹侧中部外侧系列的前板缩小，没有向腹侧拉长，第一个或第二个明显呈圆形；胸鳍不分枝鳍条在远端明显分开，有7至15个骨化节段，几乎达到其长度的一半；并且第一上鳃骨上有副突。微鳞腹吸鲶还因其其他一些骨学特征而与其同属物种相区别。文中讨论了微鳞腹吸鲶的分类学问题以及该属的分布模式。
